6- Imam Ali (AS) said, ‘Even if falsehood was isolated from being mixed with the truth, it would not be indefinable by those who aspire it; and even if the truth was free from being disguised as falsehood, the tongues of its opponents would still be silenced; but it is often made by taking a little from one and a little from the other.’
[Sharhe Nahj al-Balagha li Ibn Abi al-Hadid, v. 3, p. 240]

8- Imam al-Sadiq (AS) said, ‘Allah has refused to present falsehood as a certain truth, and He has refused to present the truth to the heart of a believer as a certain falsehood; He has also refused to present falsehood to the heart of a disbeliever as a certain truth. And had he not done thus, the truth would never be distinguished from falsehood.’
[Bihar al-Anwar, v. 5, p. 303, no. 12]